MARINE DIATOMS FROM THE COASTS OF ICELAND 353 



Diploneis? inaeqvalis sp. nov. Tab. nost., fig. 4. 

 Long: 18 /, lat: 7 /. 

 Valva elliptica. Striis uno in latere valvse 11 in 10 a, altero in 

 latere 14 in 10/f. 



Dyrafjordur (N.W.), C. H. O. 



It is with great hesitation that I refer this small species to Diplo- 

 neis. It seems closely allied to Navicula Reichardti Grun. var. Tschut- 

 chschorum Cl. Cl. Syn. II, 65'; Cl. Vega, tab. XXXVII, fig. 48. Cleve places 

 Nav. Reich, among Naviculae lyratae. 



fj *j 



In Diat. mar. p. 129 Peragallo places Nav. Reich, among Diploneis, but 

 remarks as follows: Cette espece n'est pas un vrai Diploneis, ma is ce 

 n'est pas non plus une vraie lyree car il n'y a pas de stries entre les 

 fourches on aires centrales et le raphe. 



Naviculse Fusiformes Cl. 1894. Cl. Syn., I, 105. 



Navicula Acus Cl. Cl. Syn., 1,106; Per. D. mar., Tab. VIII, fig. 23. 



Reykjavik (S.W.), C. H. O. 

 Area : Eur. 



Navicula fusiformis Grun. var. ostrearia Gaillon. Cl. Syn., 1,106; 

 V. H. Trt., Tab. XXVII, fig. 769. 



4 samples (S. 2, S.W. 2). 

 Area: Eur., Grl. 



Navicula glabra sp. nov. Tab. nost., fig. 5. 



Long: 41 //, lat: 8 /. 



Valva lanceolata. Raphe area augustissima cincta. Poris cen- 

 tralibus raphes distinctis. Structuram ullam valvae perspicere non 

 potui. 



Reykjavik (S.W.), H. Js. 



This species somewhat resembles the unnamed Navicula (from Hvid- 

 ingso), delineated in A.S.N.S. D., tab. Ill, fig. 8, which in Cleve (Syn. I, 106) 

 is found under the name of Nav. Schmidti, but Cleve, as well as Peragallo 

 (Diat. mar. p. 67 give the number of striae as 17 in 10 //, consequently 

 a distinct striation, while I have not been able to see any. By great en- 

 largement however the valves assume the peculiar misty appearance, 

 indicating a very fine structure. 



Naviculse Orthostichae Cleve 1894. Cl. Syn., I, 107. 



Navicula halophila Grun. Cl. Syn., I, 109; V. H. Trt., Tab. IV, 

 fig. 191. (N. cuspidata v. hal.). 



Reykjavik (S.W.), C. H. O. 

 Area: Eur. 



